Improvement in return-flue boiler-furnaces



CHARLES J. HARRIS. Improvement in Return-Flue Boiler-Furnaces. NO. 114,437. Pafented May 2,1871.

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CHARLES J. HARRIS, OF BLOOMINGTON, ILLINOIS.

Letters Patent No. 114,437, datedMay 2, 1871.

IMPROVEMENT IN- RET'URN-FLUE BOILER-FURNACES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.-

Be it known that I, CHARLES J. HARRIS, of Bloomington, in the county of McLean and State of Illinois, have invented certain new and useful Improvements in the Mode of Heating Steam-Boilers; and do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing and tothe letters of reference marked thereon.

The nature of my invention consists in the construction of stationary steam-boilers so as to use the exhaust steam for the purposeof heating the boiler and keeping the flnes clean and assist in creating a draught, as will be hereinafter more fully set 'forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing which forms a part of this specification, and in which- Figure l is a side elevation, part in section, and

Figure 2 is a transverse vertical section.

A represents the boiler;

B, the firebox; and

G, the smoke-flue.

D is a tube which enters the smoke-flue under the boiler, near the pointwhere the smoke and heat from the fire-box enters the tubes in a tubular boiler, or the flues in a two-fined boiler.

Instead of allowing the exhaust steam to escape in the air, as is common, it is conducted through the tube D into the smoke-flue; 'whence, with the smoke and heat from the fire, it passes through the tubes or fines, through the smoke-stack, and into the open air.

In passing the exhaust steam out in this manuerit assists in heating the boiler and creating a draught, thus causing a saving in fuel, and it also keeps the tubes and fines of the boiler clean.

Having thus fully described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

The arrangement, in a horizontal return-flue boiler, of an exhaust steam-pipe at or near the rear end of said boiler to deliver a jet of exhaust steam for the purpose of cleaning the rear end and flues of same, and assisting in creating a draught for the same, sub stantially as set forth.

In witness whereof I have hereunto set my hand this 21st (1: y of- February, 1871.

.. CHARLES J. HARRIS.

Witnesses:

Tnos. SLADE, W. MjHAToH. 

